I wanted a typical warm snare sound with beautiful rimshots. The sound is really focused and has a great balanced bass. The Ambassador X is a 12 Myl head and helps a lot to get that warm sound I was looking for. In fact,,a yellow copper snare is a brass one check here :

I'm not sure where you are getting this statement. The term "yellow copper" isn't mentioned anywhere in that article.

Brass and bronze are both copper alloys, thus they should all look pretty similar (ie. not the normally metallic grey/silver color of steel/aluminum/etc). However, I'm not sure that "yellow copper" is a nickname for brass.

I'm not sure where you are getting this statement. The term "yellow copper" isn't mentioned anywhere in that article.

Brass and bronze are both copper alloys, thus they should all look pretty similar (ie. not the normally metallic grey/silver color of steel/aluminum/etc). However, I'm not sure that "yellow copper" is a nickname for brass.

Humm indeed not mentioned in the UK Wikipedia version but in the French one, Yellow copper is given as Brass (we say in French, Laiton for Brass and Cuivre jaune for Yellow Copper). Anyways, this snare is amazing and sounds so good !